Shure SLX4/S6 - 9.5" UHF diversity receiver, display (low battery, group, channel) 960 frequencies, frequency scan, frequency transmission over infra red, pilot tone, jack/XLR out, removable BNC antennas, rear volume control, 19" rackmount included, S6 frequency range (838.000-865.000MHz), up to 20 systems in parallel (on multiple frequency bands depending on local regulations).